Portable lathe for recutting crank-shaft pins



W. H. CHAUN AND P. MATHIS.

PORTABtE LATHE FOR RECUTTING CRANK'SHAFT PINS. APPLICATION H'LED JUNE 10, 1919.

1,345, 1 38. V Patented June 29, 1920.

4 SHEETS-SHEET I.

W. H. CRAUN AND P. MATHIS. v PORTABLE LATHE FOR RECUTTING vGRANK SHAFT PINS.

APPLICATION FILED JUNE I0, 1919.

Patented J une 29, 1.920.

4 SHEETS*SHEET 2.-

W. H. CRAUN AND P. MATHIS. PORTABLE LATHE FOR RECUTTING CRANK SHAFT PINS. APPLICATION F1LEBJUNE10.19|9.

1,345, 1 38. Patented June 29, 1920.

4 SHEETS-SHEET 3.

w'. H. CRAUN AND P. MATHIS.

PORTABLE LATHE FOR RECUTTING CRANK SHAFT PINS.

APPLlcAloN Flu-:D luNE 1o, 191.9..

1,345, 1 38. l Patented June 29, 1920.

4 SHEETS-SHEET 4.

UNITED STATES PATENT OFFICE.

WILLIAM H. CRAUN, 0F HoBoKEN, NEW JERSEY, AND PAUL MATHIs, or BROOKLYN,V NEW YORK.

PORTABLE LATI-IE FOR B ECUTTING (iRANK-SHAFT PINS.

Application led June 10,

To all whom t may concern:

Be it known that we, WILLIAM H. CRAUN and PAUL MATHis, citizens of the United States, residing, respectively, at Hoboken, in the county of Hudson and State of New Jersey, and Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Portable Lathes for Recutting Crank-Shaft Pins, of which the following is a specification.

This invention relates to machines for recutting crank shafts, and pertains especially to a portable lathe applicable to crank shafts without removing such shafts from their mountings or working position for reshaping, recutting or returningr the crank member.

The prime object of the inventionis to provide a portable lathe of` special 'design applicable to vcrank shafts, especially the crank shafts of ships, for'truing the worn crank member of such shafts AWithout displacing or yremoving the shafts for such purpose. l

A further object ofthe 'invention is to provide a machine of suchl construction and arrangement of parts as to nbegapplied to crank shafts ofvariou's size, and as torbe adjustable bodily and in its parts with respect to the crank member of suchA shafts forreshaping said member without removing the'shaft from its bearings. A Y

A. still further object of the invention is to provide in a portable lathe flor recutting crank shafts, a special tool carriage, and means for revolving the carriage around the crank member of such shafts Ain a recutting operation. i 7 Y,

A till further object ofthe invention is to provide, in portable turning lathe, devices affording means for reversing the p0- sition ofthe cutting tool holder from one side to the other of the lathe, devices vfor adjusting the toolphead, and devices 'affording means for reversing the feed mechanism.

A still further object of the ,invention is to providepeculiar mechanism for transmitting power from a power source for rotaryV movement of the tool-carrying'ring, and to furnish a peculiar crankshaft clampingl yoke or frame' having journalrbearings for certain screw rods `and shaft members of the lathe.

Various other novel and peculiarrdevices are embodied in theinvention, and various other objects,'advantages and improved re- Specification of Letters Patent. Patented June 29, 1920.

1919. Serial No. 303,017.

sults are attainable in the practicalapplication of the invention, as will be hereinafter set forth. n In the accompanying drawings forming part of this application:

Figure 1 is an end view of a crank shaft showing the application of the invention.

' Fig. 2 is an edge elevation of part of what is shown in Fig. 1.

Fig. 3 is a cross section showing the application of the invention as in crank pin cutting.

Fig. 4 is an edge elevation of the lathe partly broken away.

Fig. 5 is a detail end view of the tool carriage as set into the ring gear.

Fig. 6 is a detail longitudinal section of part of the tool carriage showing means for sliding the shoes.

Fig. Y is a detail sectional view of one of the segment gears taken through one of the bearings 21 and showing one of the sleeves 19 at the extreme limit of its movement on one lof the screw shafts with a sprocket wheel in elevation.

Fig. 8 is a detail section showing one of the bearingsubetween the tool carriage ring and the outer fixed ring.

Fig. 9 is a detail sectional view of the tool holder. A l

Fig. 1() is a detail perspective view of a tool holdermember.

Fig. 11 is a detail perspectiveview of two interlocking parts of the tool holder. Fig. 12 is a detail sectional view of the pinion 6 and its housing showing the ring gear meshing therewith and partly broken away. y

Fig. 13 is anelevation showing a modification of the clamping yoke. y I

Fig. 14 is a detail elevation showing a further modification.

The same reference characters denote the same parts throughout the several views of the drawings.

We `are fully 'aware that certain devices i one end to the other of the crank members.V

It is, therefore, the purpose of our invention to provide a lathe embodying such deV vices and coperating parts as will result in true adjustment of all the parts for making a true recutting of wornV or imperfect crank members, and to insure the rendition oi' the crank members in perfect resurfacing condition without removing or displacing such shafts.

In carrying out our invention, we employ a two part outer casing ring 1, clamped together by suitable bolts 2, and having side flanges 3 forming a raceway for a two part gear wheel 4 clamped together by bolts 5, and meshing with a pinion V6 revolubly secured in a housing 7 of the ring 1 and slidably' keyed to a shaft 8, having a driven pulley 8a. The ends of the shaft 8 are held in bearings 7, of special hangers. The ring 1 has three peripheral bearings 9 for guide rods 10, the ends of which are secured in bearings 11 of a pair of centering hangers 12 adapted to be secured to the outer face and periphery of the crank arms 13 of a crank shaft 14 by means of single heads 15 having set bolts 15a, a double head 16 having set bolts 16a and a centering bolt 16b which engages a center opposite the crank pin or member 17 so as to centralize the ring 1 and the gear 4 with and around said member. Feed screws 18 have each end secured in the frames 12 and' mesh Awith screw sleeves 19- and 19EL revolubly secured by keepers 2O in housings 21 on the periphery of the ring 1, so that the latter and the carriage ring 4 may be fed lengthwise the crank shaft during the revolution of said ring gear. A beveled gear 22 is secured to the sleeves 19 and meshes at intervals with beveled toothed segments 23 secured to the face of the ring gear 4, whereby'the sleeves 19 are turned on the screws 18 one revolu- .tion to six revolutions of the gear 4, in

crank pin turning or recutting operations, as will be hereinafter more fully explained..

To insure uniform slide feeding oft' the lathe the screw sleeves have attached thereto a sprocket wheel 24 for a sprocket chain 25 which transmits driving power from a sprocket wheel 26 on one end 'of the shaft 8 to the Sleeves 19 and 19a on the screw shafts 18. These sprocket wheels and chain are on the outer side of one of the hanger frames 12, and are essential in true sliding movement of the lathe. The tool carriage is mounted on and within the ring gear 4 by means of an angular plate 27 secured to lugs 28 on the inner periphery of the gear 4 by set bolts 29. -The plate 27 has ribs 3Q under which a bottom flange 31 of slidable shoes 32 engage, and a like shoe ange 33 engages over ribs 34 on a head block 35 having depending arms 36 which suspenda pinion 37 and a gear 38'meshing with simi'- Vlar gears 39 on the ends of a right and left screw threaded rod 40 having the shoes 32 slidably screwing thereon, so as to raise and lower the head block in setting the tool for acut preparatory to starting thev lathe in slide feeding. Theribs converge inwardly on an incline, and the rod 40 has a central disk 41 working in bearings 42 formed central of the block 35 and web 36 of the plate 27. The pinion 37 meshes with a segment rack 43 pivoted to the face of the ring 1 at 44, and fulcrumed by means of a bolt 45 eX.- tending through a slot 46 in the rack, and the free end of the rack 43 has a hand rod 47 connected therewith and working through keepers 48, and cushioned by a spiral spring 49. The rack 43 has a slot 50 of sufficient width to permit the rack to be adjusted by the hand rod 47 for having either the rack teeth 51 or the rack teeth 52 mesh with the pinion 37 for advancing and reversing the travel of the shoes 32 by the gears 38 and 39 on the shoev rods 40, which results in raising and lowering the head block 357 upon which the holder 53 for a tool as 54 is mounted.

Thetool holder 53 comprises ak member 54a having a stem. 55 fitting a socket 56 in each end of the block 35, and said ends have grooves 57 into which fit projections 58 on the inner face of the member 54a soA as to afford adjustment of the member 54a on the ends of the block 35 with the stem 55 as a pivot, and said member 54a is secured in adjusted position by set bolts 59. The tool holder also' embodies means for adjusting the tool without moving or adjusting the y member 54a, and said means consists of an inner disk 60 having a central socket 61 in which the Vtool is secured as by a set bolt 62,

and the disk has a plurality of prongs 63 projecting from thev upper face and fitting cavities 64 in the member 54a. The disk 60 is held in position by a screw bushing 65 having a projecting end 66 to which mav be applied a wrench for operating the bush-- ing soas to permit the disk 6() vto be turned for adjusting the tool. It will be seen that the member 542may 'be changed from one end to the other of the block 35 without displacing or altering the position of the tool, for the purpose of 'continuing a true cut first started by the tool at one end of the crank pin and finished at the other end of the crank pin. ture for the reason that a cut as first started by the tool moving in one direction over the crank pin to its limit in said direction is continued by merely changing the post or tool holding member 54a to the opposite end of the block 35 and reversing the movement of said block. Such operations are obviously repeated if necessary until the crank This is an important fea-1 pin has been fully and desirably recut and finished. Y

rIhe tool carriage is revolved around the crank pin by the ring 4, and during such revolution the pinion 37 travels in the rack 43 for radially moving the tool while the tool is moved lengthwise the crank in a cutting operation by the gear 22 and the segments 23, and the movement of the tool is reversed by operating the rack 43 with the hand rod 41. This reversement -may be made without stopping the lathe. When the tool block 35 has carried the tool in a cutting operation to the limit in one direction the lathe is stopped and the tool holder is changed to the opposite end of said block for reverse vmovement without changing or adjusting the position of the tool in vits holder. In order to provide against frictional 'wear and resultant lost motion between the ring 1 and the gear ring 4, we form a V-shaped annular bearing 70 on the outer periphery of the ring 4, and said bearing works in a Vsshaped annular bearing 71 in an open ring 72 adjustably secured to the periphery of the ring 1, between the rings 1 and'4 byvmeans of screw bushingsr73. Obviously by operating the bushings the bushing ring 72 will take up any lost motion between the rings 1 and 4, so as to'keep the rings l and 4 always centralized.

Referring to the modification shown in Fig. 13 of the drawings, the shaft hanger may have attached thereto an extension 75 for holding an additional clampingvhead in duplication of the head 16.

Referring to the modification shown in Fig. 14, differential gears may be utilized in lieu of the pulley 8a, for gearing the lathe with driving power. In order to employ such differential gears, we provide the shaft 8 with a driven gear wheel 77 mesh-y ing with a gear wheel 78 which meshes with a gear wheel 79. The wheels 78 and 79 are journaled in a frame 8() slidably secured in slots 81 of the hanger arms 82 for the purpose of moving the intermediate wheel'78 out of mesh with the wheel 77 so as to substitute larger or smaller wheels for the wheels 78 and 79 according to the speed produced on the wheel `77 by various driving power connections.

Obviously various other duplications, me chanical changes and arrangements inand combination of the several parts of the invention may be made in manufacture and assembling the same, therefore we do not wish to limit ourselves in these respects, nor do we wish to be understood as confining the application of the machine only to crank shafts, but reserve the right to make such changes in the parts and in the construction and assembling thereof, and in various applications of the machine. as may not be inconsistent with the appended claims.

Having thus described our invention what we claim as new anddesire tosecure by Letters Patent is:

1. In portable lathe applicable to vcrank shafts for recutting the pins thereof, a casing adapted to encirclel the shaft, screw 'shafts fixed against lengthwise movement Vand having the casing mounted thereon for vlongitudinal movement, a ring gear revoluble in the casing during said longitudinal movement, a tool carriage secured to the inner periphery of the ring gear, means for operating said gear, and means operated by the ring Vgear for feeding the carriage radially. y

2. Ina portable lathe forrrecutting crank pins, a tool carriage, a gear ring upon which the carriage 'is secured for revolving the carriage, carriage mechanism operatedvby the ring for feeding the tool radially,mech anism operated by the ring for feeding the tool llongitudinally during` the revolution of the carriage in a pin cutting operation, and means attachable'to 'the crank for'permitting said movements.

3. In a portable lathe for recutting 'crank pins, a revoluble gear ring, a tool carriage secured to the ring and comprising aY pair ofslidable shoes operated by the ring for feeding the tool radially, and means for operati-ng the ring.

4. In a portable lathe for recutting crank pins, a nonerevoluble casing, a gear ring revoluble in the casing, means operated'by the 'ring for feeding the casing longitudi nally, a tool carriage secured` tothe ring, and means operated by the ring for feeding the tool radially. l 1

A. revolubly driven gear ring, a tool carriage secured within the ring'and having' a head block for raising and lowering thetool to set the latter to cut, and a tool holder adapted to be changed from one end to the other of said block without changing the position of the tool with respect to the holder.

6. A tool carriage head block having socket ends, screw operated shoes for raising and lowering the block with respect to the carriage, and a tool holder having a stem fitting the sockets for reversing the position of the holder without altering the position of the tool with respect to the holder. 7. In a tool carriage the combination with a head block having ends for applying a tool holder, of Va tool holder having a face adjustably fitting said ends, and means within the holder for adjusting the tool therein independent of said holder adjustment.

3. In means for adjusting a lathe turning tool, a tool carriage having shoe guides, a tool carriage head block having like guides, shoes engaging the guides and connecting the block with the carriage, and means for sliding the shoes between the block and the carriage for raising and lowering the block.

9. In means for operating a lathe turning tool, a revolubly driven ring gear, a tool carriage secured to the' ring and embodying a vertically adjustable head block, means for adjusting the block for cut-setting the tool, a tool holder adj ustably securable tothe ends ofthe block, means within the holder for adjusting the tool therein independent of the block adjustment, and'means for sliding said ring gear in a cutting operation of the tool.

' 10. In means for operating a lathe turning tool, a revolubly driven ring gear, a tool lcarriage secured to the ring and embodying a vertically adjustable head block, a tool holder adjustably securable to the ends of the block, means within the holder for adjustingthe tool therein independent of the block adjustment, a plurality of slidable shoes, screw rods operating the shoes for adjusting said block, a train of gears connecting the screw rods, a pinion projecting from one of the gears` of said train, a toothed segment adapted to mesh with said pinion for reversing the movement of the shoes, and means for sliding said ring gear in a tool cutting operation.

11. In a portable lathe for recutting crank pins, hangers adapted to be clampe to said .crank for suspending the ring around the pin, screw shafts having their ends anchored in the hangers, a screw sleeve retained by said ring and meshing with the screw shafts for sliding said ring,

a gear' ring revolubly contained in the casing ring and having a cutting tool mounted therein, a pinion retained in the casing ring and meshing with the gear ring, a driven shaft having said pinion slidably keyed thereto, and a gear device connecting the ring gear with the sleeve and turning the latter for sliding said rings in a tool feeding operation.

12. In a lathe adapted to be applied to mounted crank shafts for recutting the crank pins, a pair of hangers adapted to be clamped upon the outer face of the crank armsand having means for centering the frames with the center of the pins, uide rods connecting the hangers, screw s afts anchored in the hangers parallel with said rods, a ring casing slidable on the rods, screw sleeves attached to the casing and meshing with the screw shafts for sliding the casing, a pinion mounted in the casing, a ring gear revolved in the casing by said pinion, a tool carriage secured in the ring gear, a driven shaft having said pinion slidably keyed thereon, means connecting the driven shaft with the sleeves for turning the latter, and means connecting all of said shafts for unison movement in a crank pin cuttin operation.

13.- he combination of a casing, a ring gear contained in the casing, means for revolving the gear, screw sleeves held by the casing, anchored screw shafts meshing with the sleeves, a pinion secured to one of the sleeves, a segment gear secured to the Vring gear and intermittently meshing with said pinion during the revolution `of the ring gear for feeding the casing on the screw shafts.

14. In a .portable turning lathe for recutting crank shaft pins, a ring gear revolubly driven around the pin, means for adjustably mounting a cutting tool on the gear, a feed pinion, a gear segment on the ring gear intermittently meshing with the pinion for feeding the gear during its revolution, and means for revolving the ring gear in a pin cutting operation.

15. In means for attaching Ya turning lathe to' crank shafts for recutting crank pins, a pair of'hangers having bearings, means projecting from the lathe into said bearings 'for suspending the lathe around a crank pin,and clamping devices securing the hangers tothe crank arms for centralizing the lathe with respect to the crank pin.

1G. The combination of an outer ring casing, a ring gear revoluble within the casing, a bearing ring between thecasing and the gear, and means carried by the casing for controlling the bearing of the bearing ring on the gear ring. Y

17. The combination of a casing ring, a ring gear having an annular bearing protrusion, an open ring having a bearing for said protrusion, and a plurality of screw bushings working through the periphery of the casing ring for operating the split ring to compensate for lost motions between the casing ring and the ring gear.

18. The combination of an outer casing ring, a ring gear revolubly contained within the casing ring and having av Vbeveled annular bearing projecting from its periphery, an open ringhaving a bearing surface for the beveled bearing, and means working through the periphery of the casing ring for adjusting the open ring relative to said beveled bearing.

19. The combination of a nonrevoluble casing ring, a ring gear revoluble in the casing ring and having an annularly lprojecting bearing, a bearing ring between the casing ring andthe gear ring.v and having a groove fitting said annularbearing, and a plurality of bushings connecting the open ring with the casing ring and adapted to be adjusted for varying the bearing of the open ring on the said .annular bearing.

In witness whereof we hereunto set our hands in the presence of two witnesses.

wiLLnnu H. CRAUN.-4 APAUL MATHIs.

Witnesses: Sgt. BENJAMIN F. GREGORY,

ADoLF EAs'r. 

